White-Dwarf Supernovae Are Good Standard Candles for Distance Measurements for All

White-dwarf supernovae are good standard candles for distance measurements for all the following reasons except which?

A) All white-dwarf supernovae involve the explosion of stars of nearly the same mass.
B) White-dwarf supernovae are so bright that they can be detected even in very distant galaxies.
C) White-dwarf supernovae are common enough that we detect several every year.
D) White-dwarf supernovae occur only among young and extremely bright stars.
E) All white-dwarf supernovae have similar light curves,which makes them easy to distinguish from massive-star supernovae.